问题如下：
The variance of an equally weighted portfolio is least likely to be impacted by which asset characteristics according to the capital market theory.
选项：
A.Return of the asset.
B.解释：
A is correct.
When calculate the variance of one portfolio, the asset variance, correlation of the asset with others and weighting is needed. Return is not used in variance calculation.
请问老师：capital market theory.指的是什么？
